JPH0611243U - Gas circuit breaker - Google Patents

Abstract

(57) [Abstract] [Purpose] To give direction to the deteriorated gas, sufficiently replace the deteriorated gas with the insulating gas, and obtain an insulation recovery force effectively. [Structure] The arc generated when the movable contact 5 is separated from the fixed contact 3 uses an insulating gas as an arc extinguishing medium, and the drive coil 8 and the drive coil 8 arranged above both contacts 3 and 5 are arranged. It consists of an arc runner 9 on the bottom surface and a gas vent hole 1 in the center.
In a gas circuit breaker configured to be arc-extinguished by an annular arc extinguishing device 7 having 0, the arc runner 9 is surrounded by a gas flow restricting sleeve 11.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention uses an insulating gas as an arc extinguishing medium for the arc generated when the movable contact is separated from the fixed contact, and comprises a drive coil arranged above both contacts and an arc runner on the lower surface of the drive coil. The present invention relates to a gas circuit breaker in which a circular arc extinguishing device having a gas vent hole at its center is used to extinguish a rotary arc.

[0002]

[Prior art]

A conventional circuit breaker of this type has a configuration shown in FIG. In the figure, 1 is an arc extinguishing chamber filled with an insulating gas such as SF ₆ gas as an extinguishing medium, 2 is a vertically fixed conductor provided in the arc extinguishing chamber 1, and 3 is a tip of the fixed conductor 2. Of the fixed contact 4 is a movable conductor whose lower part is fixed to the main shaft to rotate, 5 is a movable contact which is formed at the tip of the movable conductor 4 and is brought into contact with and separated from the fixed contact 3, and 6 is a fixed conductor 2 at both ends And a power source connected to the movable conductor 4.

Reference numeral 7 is an annular arc extinguishing device located above both contacts 3, 5, 8 is a drive coil, and 9 is an arc runner located on the lower surface of the drive coil 8. The drive coil 8 and the arc runner 9 extinguish the arc. The arc device 7 is configured, and both ends of the drive coil 8 are connected to the fixed conductor 2 and the arc runner 9. Reference numeral 10 denotes a gas vent hole at the center of the arc extinguishing device 7.

Then, when the movable contact 5 is separated from the fixed contact 3 from the closed state and an arc is generated between the two contacts 3, 5, the arc causes a levitation force of the arc itself and a loop caused by a current flowing through the movable conductor 4. The electromagnetic force causes the arc to move upward, the arc moves from the fixed contactor 3 to the arc runner 9, the arc current flows through the drive coil 8, the drive coil 8 is excited, and the coil between the arc runner 9 and the movable contactor 5 is excited. A magnetic field is generated, and an electromagnetic force, that is, a rotating force according to Fleming's left-hand rule, acts on the arc between the arc runner 9 and the movable contact 5, and the arc rotates the arc runner 9 at a high speed in an insulating gas atmosphere. Is cooled rapidly, extinguished at the current zero point, and the cutoff is completed.

[0005]

[Problems to be solved by the device]

 In the case of the conventional gas circuit breaker, the insulating gas thermally expands due to the arc energy when the contacts 3 and 5 are separated, and the gas flow deteriorated by the thermal expansion is not unidirectional. Of the arc extinguishing device 7 and the circumference below the arc runner 9, and the gas deteriorated by thermal expansion and the surrounding non-deteriorated insulating gas are not sufficiently replaced. There is a problem that the insulation recovery power of gas cannot be obtained and the breaking performance becomes unstable.

[0006] In consideration of the above points, the present invention makes the deteriorated gas flow directional, and sufficiently replaces the deteriorated gas with the insulating gas to effectively obtain the insulation recovery force. The purpose of the present invention is to provide a gas circuit breaker with improved breaking performance.

[0007]

[Means for Solving the Problems]

 In order to solve the above-mentioned problems, the present invention provides a drive coil arranged above the both contacts using an insulating gas as an arc extinguishing medium for the arc generated when the movable contact is separated from the fixed contact. A gas circuit breaker, which is composed of an arc runner on the lower surface of the drive coil and has a gas vent hole at the center thereof and is arc-extinguished by rotation, in which the arc runner is surrounded by a sleeve for restricting gas flow. .

[0008]

[Action]

 In the gas circuit breaker of the present invention configured as described above, the circumference of the arc runner is surrounded by the sleeve for restricting the gas flow, so that the deteriorated gas thermally expanded by the arc energy at the time of opening and closing the contacts is prevented. The gas can be effectively and stably flowed in the direction of the gas vent hole, the deteriorated gas can be sufficiently replaced with the insulating gas, the insulation recovery force can be effectively obtained, and the barrier performance is improved.

[0009]

【Example】

 One embodiment will be described with reference to FIGS. 1 and 2. In these figures, the same symbols as those in FIG. 3 indicate the same or corresponding ones. 3 is different from FIG. 3 in that a pressure-increasing sleeve 11 for restricting gas flow is continuously formed downward from the peripheral edge of the disc-shaped arc runner 9, and the circumference of the arc runner 9 is surrounded by the sleeve 11. A point 12 is a part of the sleeve 11, and a notch 12 in which the fixed contactor 3 is located is formed.

Then, the movable contact 5 is separated from the fixed contact 3 from the closed state to generate an arc, and the deteriorated gas thermally expanded by the arc energy is guided by the sleeve 11 and directed toward the gas vent hole 10. The insulating gas flows from below, and the deteriorated gas is replaced with the insulating gas.

[0011]

[Effect of device]

 Since the present invention is configured as described above, it has the following effects. In the gas circuit breaker of the present invention, since the arc runner 9 is surrounded by the gas flow restricting sleeve 11, the deteriorated gas thermally expanded by the arc energy when the contacts 3 and 5 are opened is separated from the gas. It is possible to effectively and stably flow in the direction of the vent hole 10, the deteriorated gas can be sufficiently replaced with the insulating gas, the insulation recovery force can be effectively obtained, and the barrier performance is improved. can do.

[Brief description of drawings]

FIG. 1 is a cutaway front view of an embodiment of the present invention.

FIG. 2 is a bottom view of a portion of FIG.

FIG. 3 is a cut front view of a conventional example.

[Explanation of symbols]

 3 Fixed contactor 5 Movable contactor 7 Arc extinguishing device 8 Drive coil 9 Arc runner 10 Gas vent hole 11 Sleeve

Claims (1)

[Scope of utility model registration request] 1. An arc generated when the movable contact is separated from a fixed contact uses an insulating gas as an arc extinguishing medium, and a drive coil disposed above the contacts and an arc runner on the lower surface of the drive coil. A gas circuit breaker configured to be arc-extinguished by an annular arc extinguishing device having a gas vent hole at the center, wherein the arc runner is surrounded by a gas flow restricting sleeve.